Improvement in devices for cutting screw-threads and for drilling metals



lJ' AMES W. -MAHLON, OF BROOKLYN, -NEW YORK.

lLeiters rement Ne. 109,746, aerea November 29, 1870.

IMPROVEMENT lN VDEVICES FOR ACUTTING SCREW-THREADS AND FOR DRILLING METALS.

The 'Schedule referred to` in these Lettere Patent and making parl: of the same.

To all whom it may concern:

Be it known that I, J AMES W. MAHLON, ofBrooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Hand-Tools for Screwing and Drilling, of whiel'rthe following is a full, clear, and exact description, reference being had to the accompanying drawing forming part of this specification.

This invention consistsin the novel combination of an ordinary die-stock body, with a ratchet-drill brace, whereby I obtain a ratchet-die stock, the parts of which are separable, one for screwing, as with an ordinary die-stock, and the other for drilling.

Figure l is a plan, and

Figure 2, a side view, partly in section, of a diestock furnished with handles, but constructed to form part ofthe ratchet-die stock, iig. 1 representing the die lexposed by the removal of the covering-plate, of which Figure 3 is a face view.

Figure 4 represents a side view. of the ratchet-die stock, completed by the attachment ot' the ratchetdrill brace, and e Figure 5, is an axial section of the same.

Figure (i is a partly-broken side view of the ratchetbrace.

Figure 7 is a perspective view of a guard, to'be slipped on the tool, 4to prevent injury to a wall or contiguous surface in the operation of the tool.-v

Referring, in the rst instance, to figsl 1 and 2 of the drawing- A represents the body or die-holding portion of a dic-stock, provided with a socket, a, on the one face of it, and which serves to carry a pipe, guide, or sleeve, b, oi' any desired size, according to the size of the pipe to be operated on, said sleeve 'being held to its place by a set-screw, c, to facilitate the changing` of it for another of different size. y

B is thc die, which may be inadein one piece, and

,be inserted to its place in the die-stock by' simply droppingr it into a chamber, d, therein, through the opposite face ot' the stock to that on which the socket a is arranged.

This opposite side or face of the stock is formed with a recess, c, within ,which is tted a plate, D, when it is required to work 'the' die-stockin the ordinary way by means of handles ff.

Said plate 1) serres to hohl the die in ,its place, and is secured to the body'A by screws g, so as to bc detachable therefrom. f

The handles j' f are also lmade detachable, at pleasure, by nie-ans of `a screw-thread cutou their ends made to iit female threads in the ends of' the body A. Y

Wheu it is required to work the die-stock by a ratchet motion, as in cases where there is not room. 'i'or operating it by the handles f f, said handles are removed and the `plate D also, detached, and the'` body 7i. of a.v ratchet-operating attachment E (see figs. L and 5) inserted within .the recess e, and secured therein -by means of the screws g, the die B occupying the same position in the body A` as before.

on or firmly secured to it, and constitutes a bearing.

for the operating level Z(carrying a spring-borne pawl, 111,) to turn upon.

The body-portion h oi' this ratchet attachment E may be provided with a lubricating aperture, s, and is made at its base or inner vend with a recess of lthe size and coniiguration ot' the die B, into which recess is loosely fitted a blank, o, that serves'to keep the'die in its seat.

The stock-body A, having the ratchet-operatipg device thus attached to it, may then be worked-as a ratchet-drill is operated, to cut a screw-thread on a pipe, as represented in iig. 3, and it is in the tool so organized that this invention mainly consists, l

i To secure grip on the work at starting, or toestart the cut, a lever-feeder, F, may be loosely and teniporarily applied to the back the* tocl, said device consisting cf a hand-lever, to give the requisite press.

lend into any convenient iixture, to forni a Fulcrum or' rest for the hand-,lever of the device F.

4G, tig. 7, is a guard, having one, two, or more straight sides, 'and a circular hole through itsnbase, to provide for its loose fit over a circular collar r on the shank j. d

This guard operates by its projecting sidel or sides to protect the wall or other surface the tool is working close up to from being bruised or injured by the tool.

\Vhatis here claimed, and desired to besecured by Letters Patent, is-

The die-stock body A, detachable handles f, socket a, hollow body h, and the ratehet-and-pawl mechanism,l/jt)intly, the several parts being constructed and fitted to co-operate in the cutting of screw-threads, or drilling of metals to the extent and in the manuel' substantially as'described. JAMES 7. MAHLON. Witnesses y FRED. HAYNns, R. E. RABEAU.

sind eine. 

